The catted downpipe is going to help you with emissions testing where he one you have right now won't. It's worth is dependent on if you have emissions testing in your area. If you do, then it might be a good idea. If not, I wouldn't worry too much about it. As for noise, the catted model is going to be a little quieter, but nothing that you'd write home about (Maybe a few db's).

Sorry, topic a little old but i didn't want to start a new one. I have emissions testing here in Atlanta, GA but i think it's the kind where they plug a computer into your car and then do whatever. At least that was what they did to my volvo, they just took a cord and plugged it into a socket by my middle armrest/compartment thingy. So, I really want to catless downpipe but I don't want to get in trouble for it :/. And also, I heard that the smell of the catless will be a lot stronger than one, is this true?

Sorry, topic a little old but i didn't want to start a new one. I have emissions testing here in Atlanta, GA but i think it's the kind where they plug a computer into your car and then do whatever. At least that was what they did to my volvo, they just took a cord and plugged it into a socket by my middle armrest/compartment thingy.

That's OBDII testing. You'll pass if you have a CEL fix or an EM that eliminates those codes.

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And also, I heard that the smell of the catless will be a lot stronger than one, is this true?

Yes, It will smell like gasoline at some points. Depends on your tuning.

Mine stinks on start up and i have a catted helix DP. I think for enviromental reasons you should go with a catted DP. Its not real clean but its better than no cat at all. Just help the planet out a bit. Its only like a 100 bucks more and you won't loose hardly an power to it.
- Jacob

Mine stinks on start up and i have a catted helix DP. I think for enviromental reasons you should go with a catted DP. Its not real clean but its better than no cat at all. Just help the planet out a bit. Its only like a 100 bucks more and you won't loose hardly an power to it.
- Jacob